sam, talk us through the science here. how much longer should they be nervous in hawaii this morning? >> well, the good news is, dan, that they did everything right here. i mean when you get a 7.7 on the western coast of canada, and you've got nothing but open water between it and hawaii, and this was a subsidence kind of quake, which means the plates are lying underneath each other. the other kicks the plate up. acts like a splash or flipper and creates a wave, if not just one wave, they thought it was four waves or think it's four waves as we've been counting them and have the tsunami warning center. all the buoys mean that those at the coastline are able to monitor the lift in the water, so the buoys got a tail underneath it and the sensor knows how high that wave is. we know they could have been very high. they could have been eight-foot waves but they weren't. anywhere from 6 inches to 2 feet to 4 feet as we've been able to monitor them. the good news. we've seen them move through and usually more than one and been ab